Air vessel for water-supply pipes.



K. ROMSTAEDT. AIR VESSEL m. WATER SUPPLY PIPES.

APPLICATION FILED OUT. 3, 1907.

Patented Dec. 7, 1909.

To all whom it may concern:

.K'ARL ROMSTAEDT, or BERLIN, GERMANY.

AIR VESSEL FOR WATER-SUPPLY PIPES.

Specification of Letters Patent.

Patented Dec. 7, 1909.

Application filed October 3, 1907; Serial No. 395,751.

Be it known that I, KARL subject of the Emperor of Germany, residing at Berlin Krautstrasse 52, in the -Empire of Germany, have invented certain Improvements in Air Vessels for Water-Supply Pipes, of which the following is a SPGCP fication.

This invention relates to improvements in shock 'absorbersfor water pipe systems for neutralizing the concussion resulting from water hammers and the sudden shutting off of valves so as to relieve the piping system of the strain resulting therefrom.

The invention will be more'fully described in connection with the accompanying drawing and will be more particularly pointed out in and by the appended claims.

The drawing illustrates a vertical longitudinal section of a shock absorber embodying' the main features of my invention.

As shown the device of my invention comprises a casing in which is formed a lower chambera, relatively restricted in size, and

connected with and communicating with a pipeg which may form an extension of a service pipe or a connection with the piping system in any desirable manner, not herein shown. The casing is also provided with a chamber 1) which is preferably disposed in superposed relation with respect to the chamber a somewhat with respect to the chamber a. The chamber?) is in communication with the chamber a, at its lower end, and at its upper end the chamber 1) is closed by the plug f.

It will be seen from the foregoing that both chambers are completely closed except at the point of communication with each other and with the pipe 7. The chamber 7) communicates with the chamber a through] an opening 6 which is relatively restricted with respect to the diameter of either of the chambers a or b and around which is formed a valve seat 01 The wall of the chamber isofi-set outwardly at b from the valve seat 0 as clearly shown. A valve'seat g is provided and is conveniently formed on the upper endof the pipe 9. The pipe 9 has threaded connection with the walls of the chamber a and the latter is somewhat largerthan the exterior diameter of the pipe 9 so as to aiiord a space a similar to the space RQMSTAEDT, a

and which is preferably enlarged the valves e andd are herein shown as spherical 1n form andeach of said valves is heavier thananv equal volume of water so that said valves will sink in the chambers and always automatically seat in the manner shown in the drawing- The opening 6 adjacent the hamber a is provided with a valve seat a upon which the valved seats when in the position shown in dotted lines.

-The operation is as follows:-In order that the device maybe made sensitive to the slightest disturbance in the water pipe it should be noted that the ball valve d is hollow and therefore lighter relatively in proportion to its size than the ball valve 0,

ed loosely upon the valve seat g.- Both of J yet its specific gravity exceeds that of water, therefore it is more readily responsive to any increase of pressure of the water supply. The two valves d and e are not .intended to be tight fitting but should permitthe passage of air and water in a limited volume, their office being more especially to retard the movement of air and water into and out of their respective air chambers a and b.

The pressure in the pipe causes the water to rise in. the chambers of the device until the air pressure therein equals or sustains the pressure of the water in the pipe. Upon opening the outlet valve the pressure in the pipe relaxes permitting the expansive power of the air in the chambers a and b to force the water out, but uponthe sudden closing of the outlet valve the water will again rush back into the chambers lifting. the valves cl and e, and as these valves again fallback into their seats they retard the outflow of water and prevent continued pulsations in the pipe, the water gradually flowing out around the valves until the pressure becomes normal or equalized in the chambers and pipe. In this-manner theacti'on of the two valves d and e in yieldingly checking the upward thrust of the sudden pressure, then in a measure barring the way of escape from their respective air chambers of the chamber a.

I I claim too 1. A shock absorber for water supply pipes comprising in combination, a relatively restricted elongated closed chamber adapted to communicate with a supply pipe, a gravity acting ball valve heavler than Water and serving to normally close communication between said chamber and said pipe, an elongated closed chamber superimposed onand communicating with said first mentioned member and relatively enlarged with respect thereto, .and a gravity acting ball valve heavier than water and of greater weight than said first mentioned valve and normally closing communication, between said chambers. v

2. A shock absorber for Water ,su ply pipes comprising in combination, a 'c osed chamber adapted to communicate with the posed on an communicating with said first mentioned chamber, and a gravity acting ball valve heavier than water and of greater weight than said first mentioned valve and normally said chambers. 4 I In test1mon whereof I aflix my signature in presence 0 two witnesses.

KARL ,ROMSTAEDT.

Witnesses HENRY HASPER WOLDEMAR HAUPT.

closing communication between 

